转载  C#类实现字符串的公共操作二——字符串过滤 收藏
using System;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;
using System.IO;
using System.Drawing.Imaging;
using System.Text;
using System.Web.Security;
namespace WeYyzyq.Comp
{
/// <summary>
/// 对一些字符串进行操作的类
/// </summary>
public class StringUtil
{
private static string passWord; //加密字符串
/// <summary>
/// 判断输入是否数字
/// </summary>
/
// <param name="num">要判断的字符串</param>
/// <returns></returns>
static public bool VldInt(string num)
{
#region
字符串长度截取try
{
Convert.ToInt32(num);
return true;
}
catch { return false; }
#endregion
}
/// <summary>
/// 返回文本编辑器替换后的字符串
/// </summary>
/// <param name="str">要替换的字符串</param>
/// <returns></returns>
static public string GetHtmlEditReplace(string str)
{
#region
return str.Replace("'", "''").Replace(" ", " ").Replace(",", "，").Replace("%", "％").Replace("script","").Replace(".js","");
#endregion
}
/// <summary>
/// 截取字符串函数
/// </summary>
/// <param name="str">所要截取的字符串</param>
/// <param name="num">截取字符串的长度</param>
/// <returns></returns>
static public string GetSubString(string str, int num)
{
#region
return (str.Length > num) ? str.Substring(0, num) + "..." : str;
#endregion
}
/// <summary>
/// 过滤输入信息
/// </summary>
/// <param name="text">内容</param>
/// <param name="maxLength">最大长度</param>
/// <returns></returns>
public static string InputText(string text, int maxLength)
{
#region
text = text.Trim();
if (string.IsNullOrEmpty(text))
return string.Empty;
if (text.Length > maxLength)
text = text.Substring(0, maxLength);
text = Regex.Replace(text, "[\\s]{2,}", " "); //two or more spaces
text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|\\n)*?>)", "\n"); //<br>
text = Regex.Replace(text, "(\\s*&[n|N][b|B][s|S][p|P];\\s*)+", " "); // 
text = Regex.Replace(text, "<(.|\\n)*?>", string.Empty); //any other tags
text = text.Replace("'", "''");
return text;
#endregion
}
/// <summary>
/// 生成随机数
/// </summary>
/// <re
turns></returns>
private string GenerateCheckCode()
{
#region
int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random();
for (int i = 0; i < 5; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
HttpContext.Current.Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
return checkCode;
#endregion
}
/// <summary>
/// 生成验证码图片
/// </summary>
public void CreateCheckCodeImage()
{
#region
string checkCode = GenerateCheckCode();
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景
g.Clear(Color.White);
//画图片的背景噪音线
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
//画图片的前景噪音点
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Respo
nse.ContentType = "image/Gif";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
#endregion
}
/// <summary>
/// 获取汉字第一个拼音
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
static public string getSpells(string input)
{
#region
int len = input.Length;
string reVal = "";
for (int i = 0; i < len; i++)
{
reVal += getSpell(input.Substring(i, 1));
}
return reVal;
#endregion
}
static public string getSpell(string cn)
{
#region
byte[] arrCN = Encoding.Default.GetBytes(cn);
if (arrCN.Length > 1)
{
int area = (short)arrCN[0];
int pos = (short)arrCN[1];
int code = (area << 8) + pos;
int[] areacode = { 45217, 45253, 45761, 46318, 46826, 47010, 47297, 47614, 48119, 48119, 49062, 49324, 49896, 50371, 50614, 50622, 50906, 51387, 51446, 52218, 52698, 52698, 52698, 52980, 53689, 54481 };
for (int i = 0; i < 26; i++)
{
int max = 55290;
if (i != 25) max = areacode[i + 1];
if (areacode[i] <= code && code < max)
{
return Encoding.Default.GetString(new byte[] { (byte)(65 + i) });
}
}
return "?";
}
else return cn;
#endregion
}
/// <summary>
/// 半角转全角
/// </summary>
/// <param name="BJstr"></param>
/// <returns></returns>
static public string GetQuanJiao(string BJstr)
{
#region
char[] c = BJstr.ToCharArray();
for (int i = 0; i < c.Length; i++)
{
byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, 1);
if (b.Length == 2)
{
if (b[1] == 0)
{
b[0] = (byte)(b[0] - 32);
b[1] = 255;
c[i] = System.Text.Encoding.Unicode.GetChars(b)[0];
}
}
}
string strNew = new string(c);
return strNew;
#endregion
}
/// <summary>
/// 全角转半角
/// </summary>
/// <param name="QJstr"></param>
/// <returns></returns>
static public string GetBanJiao(string QJstr)
{
#region
char[] c = QJstr.ToCharArray();
for (int i
= 0; i < c.Length; i++)
{
byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, 1);
if (b.Length == 2)
{
if (b[1] == 255)
{
b[0] = (byte)(b[0] + 32);
b[1] = 0;
c[i] = System.Text.Encoding.Unicode.GetChars(b)[0];
}
}
}
string strNew = new string(c);
return strNew;
#endregion
}
#region 加密的类型
/// <summary>
/// 加密的类型
/// </summary>
public enum PasswordType
{
SHA1,
MD5
}
#endregion
/// <summary>
/
// 字符串加密
/// </summary>
/// <param name="PasswordString">要加密的字符串</param>
/// <param name="PasswordFormat">要加密的类别</param>
/// <returns></returns>
static public string EncryptPassword(string PasswordString, string PasswordFormat)
{
#region
switch (PasswordFormat)
{
case "SHA1":
{
passWord = FormsAuthentication.HashPasswordForStoringInConfigFile(PasswordString, "SHA1");
break;
}
case "MD5":
{
passWord = FormsAuthentication.HashPasswordForStoringInConfigFile(PasswordString, "MD5");
break;
}
default:
{
passWord = string.Empty;
break;
}
}
return passWord;
#endregion
}
}
}

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。